Fix "no such attribute $!wrapped-perl5-object" error in destructors
Fix "no such attribute $!wrapped-perl5-object" error in destructors

Only leaf classes of the wrapper class hierarchy get a $!wrapped-perl5-object
attribute, so we have to look there for it when trying to undef it in the
destructor.

niner/Inline-Perl5,niner/Inline-Perl5